package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * @package: com.hmdp.utils
 * @className: RedisWorker
 * @author: 云溪
 * @description:
 * @date: 2025/9/8 22:57
 * @version: 1.0
 */
@Component
public class RedisWorker {

    private static final long BEGIN_TIMESTAMP = 1757289600;
    private static final long COUNT_BITS = 32;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public long nextId(String keyPrefix) {
        // 1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        // 2.生成序列号
        // 2.1.获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        // 2.2.自增长
        long count = stringRedisTemplate.opsForValue().increment("incr:" + keyPrefix + ":" + date);
        // 3.拼接并返回
        return timestamp << COUNT_BITS | count;
    }

    // public static void main(String[] args) {
    //     LocalDateTime now = LocalDateTime.of(2025, 9, 8, 0, 0);
    //     long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
    //     System.out.println("second: " + nowSecond);
    // }


}
